Wormfang Manta 
Creature — Nightmare Fish Beast
$0.53 #22802 0.88 24.3 years
Flying
When this creature enters, you skip your next turn.
When this creature leaves the battlefield, you take an extra turn after this one.
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Cards similar to Wormfang Manta expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Eater of Days84%
$0.94↑#11751↑0.68↓22.6 years↓
"When this creature enters, you skip your next two turns."
Magosi, the Waterveil78%
$1.04↑#13705↑0.28↓16.9 years↓
", 
: Put an eon counter on this land. Skip your next turn."
, : Put an eon counter on this land. Skip your next turn."
Vampire Interloper75%
$0.14↓#215240.00↓14.9 years↓
"Flying"
Piranha Fly75%
$0.05↓#250040.15↓1.9 years↓
"Flying"
Temporal Manipulation74%
$4.59↑#3124↑1.50↑28.2 years↑
"Take an extra turn after this one."
Capture of Jingzhou74%
$7.45↑#5084↑1.29↑27.3 years↑
"Take an extra turn after this one."
Watcher for Tomorrow70%
$0.20↓#7470↑0.29↓7.2 years↓
"When this creature leaves the battlefield, put the exiled card into its owner's hand."
Aven Riftwatcher70%
$0.06↓#223760.00↓19.6 years↓
"Flying"
Illusory Demon70%
$0.09↓#31080↓0.47↓17.3 years↓
"Flying"
Foul Imp70%
$0.05↓#29711↓0.27↓28.5 years↑
"Flying"